Mechanical properties of refractory castables bonded with hydratable magnesium carboxylate-boric acid

Chen, Jianjun; Xiao, Guoqing; Ding, Donghai; Zhang, Shaowei; Zang, Yunfei; Ren, Yun

doi:10.1016/j.ceramint.2021.04.125

Cited by 10 publications

(7 citation statements)

References 40 publications

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“…Besides, the CMOR of HMCC presented a substantial increase due to the generation of the ceramic bond after firing at 1500°C as reported in the literature 29 . The permanent liner change of HMCC is −0.045% which presented a volume shrinkage of the HMCC as shown in Figure 2D, it can be explained that the boric acid can induce the sintering of castables and the densification of the matrix as reported in the literature 30 . Comparatively, the CACC presented a volume expansion due to the generation of CA 6 .…”

Section: Resultssupporting

confidence: 71%

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Gas permeability of alumina–spinel refractory castables bonded with hydratable magnesium carboxylate

et al. 2023

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The high level of gas permeability can effectively reduce the explosive spalling risk of refractory castables. The hydratable magnesium carboxylate (HMC) is expected to improve the permeability of castables owing to the thermal decomposition of the HMC hydrates. This study compared the gas permeability and explosive spalling resistance of HMC bonded refractory castables (HMCC) with calcium aluminate cement bonded refractory castables (CACC). Thermal decomposition of (Mg3(C6H5O7)2∙11H2O) (hydrates of HMC), drying behavior, and the pores size distribution of castables were investigated. The level of gas permeability of HMCC is higher than that of CACC, which was confirmed by the higher values of Darcian k1 and non‐Darcian k2. The degas temperatures of HMC hydrates (156°C) and HMCC (432°C) are lower than those of CAC hydrates (289°C) and CACC (536°C) at a heating rate of 20°C/min, respectively. The large‐size and more permeable pores in HMCC were obtained according to the mercury intrusion porosimeter (MIP) results, which formed the connected paths for gases (H2O, CO2, C2H4, CO, CH4) released from the castables.This article is protected by copyright. All rights reserved

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Section: Resultssupporting

confidence: 71%

“…a volume shrinkage of the HMCC as shown in Figure 2D, it can be explained that the boric acid can induce the sintering of castables and the densification of the matrix as reported in the literature. 30 Comparatively, the CACC presented a volume expansion due to the generation of CA 6 .…”

Section: Figurementioning

confidence: 96%

Gas permeability of alumina–spinel refractory castables bonded with hydratable magnesium carboxylate

et al. 2023

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“…Therefore, for practical implementation, improving the mechanical properties of castables bonded with HMC at intermediate temperatures is crucial. Our preliminary research indicates that by adding a sintering aid‐boric acid, the mid‐temperature mechanical properties of the castables bonded with hydrable magnesium carboxylate could be improved without compromising its high‐temperature mechanical properties 8 . After the addition of boric acid, the CMOR of the castable increased by 1166.7% and 233.3% at 400 and 800°C, respectively.…”

Section: Introductionmentioning

confidence: 87%

“…MgO binder has been identified as a crucial material in preparing high‐performance Al 2 O 3 –MgO refractory castables due to its ability to enhance the overall cleanliness of the castables 1–7 . However, the significant disparity in density values between MgO and Mg(OH) 2 has resulted in inadequate volume stability of MgO binders, thereby constraining their widespread application, which, in turn, has led to developing hydrable magnesium carboxylate binders 8–11 . Hydrable magnesium carboxylate is a hydraulic MgO‐based cementitious material that exhibits excellent volume stability, and the green mechanical strength of its bonded castable is comparable to that of the castables bonded with calcium aluminate cement (CAC).…”

Section: Introductionmentioning

confidence: 99%

Improving the mechanical property of the castables bonded with hydratable magnesium carboxylate by incorporating MgO fumes

Chen,

Xiao,

Ding

et al. 2024

Int J Applied Ceramic Tech

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Previous studies have indicated that hydratable magnesium carboxylate (HMC) exhibits potential as an MgO‐based binder, but its limited medium‐temperature strength has hindered its widespread industrial application. In this study, the incorporation of MgO fumes into castables is intended to react with microsilica to form magnesium–silicate–hydrate (M–S–H), and the synergistic effect of HMC and M–S–H is anticipated to improve the mechanical properties of castables at intermediate temperatures. The effects of MgO fumes on the properties of HMC‐bonded castables were comprehensively investigated. The results demonstrate that incorporating MgO fumes into castable serves multiple functions. The ionized MgOH+ from MgO fumes hinders the hydration process of HMC, prolonging the final setting time from 13 to 98 min and improving the workability of castables. The incorporation of MC‐1100 enhanced mechanical properties at medium temperature due to the synergistic effects of brucite, HMC, and M–S–H. Specifically, the CMOR increased 20% after sintering at 800°C. Furthermore, adding MC‐1100 increases the residual strength rate of castable by 10% compared to those without MgO fumes. This can be attributed to enhanced spinel formation resulting from adding MgO fumes that improves elastic modulus and reduces elastic strain energy generation during thermal shock, thus increasing crack propagation resistance.

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“…The additional expansion brought by in-situ MA spinel can consequently deteriorate the volume stability of castables prepared with CAC at elevated temperatures, and thus, worsen the structural integrity of linings in practice. 10 Therefore, several approaches have been attempted to improve the volume stability of castables containing CAC via optimizing the experimental conditions and formulations such as changing curing time, 11 introducing microsilica, 12,13 altering the binder system, [14][15][16][17] adding TiO 2 and rare earth oxides, 18,19 using micro-or nano-sized powders [20][21][22][23] and MgO-bearing precursors. 24,25 The addition of additives is the most clear-cut method in improving the volume stability of CAC-bonding castables.…”

Section: Introductionmentioning

confidence: 99%

Effect of water‐soluble magnesium lactate on the volume stability of refractory castables containing calcium aluminate cement

Zong-qiang

et al. 2021

Int J Applied Ceramic Tech

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A kind of organic magnesium salt, water-soluble magnesium lactate, was used as the MgO-precursor in new forms to identify the particular impact of additive dispersity on properties of calcium aluminate cement (CAC)-bonded castables, especially the volume stability. Magnesium lactate could dissolve in water in the mixing process, distribute uniformly, and decompose during heating, providing space for counterbalancing the expansion from in-situ calcium aluminates and MgAl 2 O 4 spinel generation. Hence, in this study, CAC-bonded castables containing 0-1.2 wt% magnesium lactate were prepared. The volume stability and thermo-mechanical strength of castables were tested. Results show that the dissolution of magnesium lactate in water distinctly enhances the volume stability of castables. To understand the underlying mechanism of water-soluble magnesium lactate on the samples, phase compositions and microstructure development of castable matrices were examined.

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Mechanical properties of refractory castables bonded with hydratable magnesium carboxylate-boric acid

Cited by 10 publications

References 40 publications

Gas permeability of alumina–spinel refractory castables bonded with hydratable magnesium carboxylate

Gas permeability of alumina–spinel refractory castables bonded with hydratable magnesium carboxylate

Improving the mechanical property of the castables bonded with hydratable magnesium carboxylate by incorporating MgO fumes

Effect of water‐soluble magnesium lactate on the volume stability of refractory castables containing calcium aluminate cement

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